Niluka Karunaratne

Karunaratne, born in the coastal area of Galle, received his primary and secondary education in Dharmasoka College, Ambalangoda and Royal College, Colombo, where he won the Royal Crown in 2001. He took up badminton at the age of 8, having been introduced to the sport by his father, who was a national level badminton player. He became the youngest ever Sri Lankan national badminton champion at the age of 16 in 2001 after winning his maiden national title on debut appearance at the Sri Lankan Badminton Nationals.

Karunaratne competed in five consecutives Commonwealth Games from 2002 to 2018. At the 2014 Commonwealth Games, he was knocked out of the men's singles in the round of 16 by Srikanth Kidambi. He was also part of the Sri Lankan mixed badminton team, which was knocked out at the quarterfinal stage by England.

He won his first international badminton championship in 2011 after emerging victorious in the men's singles event at the Puerto Rico International. He also set a record for winning most consecutive number of men's singles title at the Sri Lankan Badminton Nationals during 9 occasions from 2000 to 2009.

As of July 2012, he was ranked 48th in the men's singles from the BWF World Ranking. In 2012, the Sri Lankan Daily News called him "Sri Lanka’s undisputed badminton champion".

He was selected to captain the Sri Lankan contingent to the 2012 Summer Olympics in his debut Olympic appearance and was also the flagbearer for Sri Lanka during the closing ceremony of the 2012 Summer Olympics. On 30 July 2012, Karunaratne defeated world eighth-ranked Kenichi Tago of Japan 2–0. Karunaratne defeated Tago 21–18, 21–16 in 44 minutes at the Wembley Arena in the Olympic men's badminton singles Group C at the 2012 Summer Olympics. The Associated Press quoted him as saying: "This is the biggest win in the history of Sri Lanka badminton". India's Parupalli Kashyap defeated him in a closely fought pre-quarter match.

• Karunaratne signing autographs for fans
• Karunaratne at the London 2012 Olympics

He made his second Summer Olympics appearance at the 2016 Summer Olympics representing Sri Lanka amid various difficulties as he was not eligible to compete in local and international badminton events due to the temporary ban on Sri Lankan Badminton Federation imposed by the Badminton World Federation in 2015.

In January 2021, he tested positive for COVID-19 along with his younger brother Chamika and Niluka was disbanded from the National Badminton Association. However, he pledged to participate in badminton competitions after recovering from COVID-19 and in February 2021, he along with his younger brother and national cricketer Chamika Karunaratne played in the first round encounters in the men's singles of the Sri Lankan Badminton Nationals 2020. He announced his retirement from competing in local events after claiming the national badminton title for the record seventeenth time in 2021. However, he continued to compete in foreign competition with the aim of qualifying for the 2020 Summer Olympics in Tokyo. In May 2021, Niluka reached the semifinals of the 56th edition of the Portuguese International Badminton Championships but was eliminated from the semis after losing to Germany's Max Weisskirchen.

He also qualified to represent Sri Lanka at the 2020 Summer Olympics after receiving tripartite commission quota from Badminton World Federation and it would also mark his third appearance at the Olympics and also went onto become the sixth Sri Lankan competitor to qualify for the Tokyo Olympics. He will also become the first Sri Lankan badminton player to compete at three successive Olympics. He announced that he would officially retire from international badminton after competing at the delayed 2020 Tokyo Olympics in July 2021. He was accompanied by his brother Dinuka Karunaratne as his partner in lead up to the 2020 Olympics.

He also holds a position in the banking sector as a bank employee.